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Fluid dynamics is a branch of fluid mechanics that describes the flow of fluids such as liquids and gases.
- Fluid dynamics is used in the study of ocean tides, plate tectonics, weather patterns, planet evolution, and blood circulation.
- A fluid is a substance that has no definite structure and rapidly responds to external pressure.
- The branch of physics known as fluid mechanics studies the mechanics of fluids and the forces acting upon them.
- Fluid mechanics are divided into two categories: Fluid statics and Fluid dynamics
- The two branches of fluid dynamics are hydrodynamics and aerodynamics.
- Aerodynamics is the study of the airflow pattern surrounding automobiles and airplanes to improve motion efficiency.
- Hydrodynamics studies the movement of water around ships, through pipes, and beneath the earth.
Very Short Answers Questions [1 Mark Questions]
Ques. The Bernoulli’s equation in fluid dynamics is valid for
- Transient flows
- Viscous flows
- Compressible flows
- Continuous flows
Ans. The correct answer is d. Continuous flows
Explanation: Bernoulli's theorem applies only to ideal, steady, incompressible, continuous, inviscid, and irrotational flows.
Ques. The layer of fluid that sticks to a solid surface is called
- Fluid layer
- Solid layer
- Boundary layer
- Liquid layer
Ans. The correct answer is c. Boundary layer
Explanation: This boundary layer is responsible for the decrease in fluid flow speed.
Ques. If compressibility force and surface tension forces are neglected from Newton’s second law of motion, which of the following equations results
- Bernoulli’s equation
- Navier-Stokes equation
- Reynolds equation
- Euler’s equation
Ans. The correct answer is c. Reynolds equation
Explanation: Gravity, viscosity, pressure, turbulence, surface tension, and compressibility forces are all part of Newton's second law of motion. The Reynolds equation includes four forces. To determine the Reynolds equation, surface tension and compressibility forces are neglected.
Ques. The compressible flow is assumed to be
- Adiabatic only
- Isentropic only
- Polytropic
- Isentropic and adiabatic
Ans. The correct answer is b. Isentropic only
Explanation: Compressible flow is a discipline of fluid mechanics that studies different types of flow. Its primary significance comes from the change in fluid density. It is concerned with the dynamics of gases. The flow is considered to be isentropic.
Ques. Water contains which of the following energies?
- Geothermal energy
- Solar energy and nuclear energy
- Kinetic energy and potential energy
- Thermal energy
Ans. The correct answer is c. Kinetic energy and potential energy
Explanation: Because water contains both kinetic and potential energy, it is used in the production of electricity.
Ques. Is a three-dimensional flow seen in liquids.
- True
- False
Ans. The correct answer is a. True
Explanation: In liquids, three-dimensional flow is observed. Three-dimensional flow, as compared to two-dimensional flow, includes fluid movement in all three dimensions: depth, width, and length.
Ques. What are the factors that affect fluid flow?
Ans. The factors that affect the flow of fluids are
- Velocity
- Density
- Viscosity
Ques. Define irrotational flow.
Ans. Irrotational flow is described as flow in which fluid particles do not rotate about their own axis as they move along flow lines.
Ques. In which type of fluid flow do particles move along a well-defined path?
- Steady Flow
- Laminar flow
- Incompressible flow
- Turbulent flow
Ans. The correct answer is b. Laminar flow
Explanation: In laminar flow, fluid particles move along well-defined, smooth paths, or streamlines.
Ques. Disorderly mode of flow in liquids is referred to as
- Turbulent
- Flowy
- Windy
- Breezy
Ans. The correct answer is a. Turbulent
Explanation: Turbulent flow is a disordered and chaotic type of fluid flow characterized by irregular, swirling eddies and rapid changes in velocity and pressure.
Short Answers Questions [2 Marks Questions]
Ques. What is fluid dynamics?
Ans. Fluid dynamics is a branch of fluid mechanics that studies the movement of liquids and gases. Aerodynamics and hydrodynamics are two of its subdisciplines. Fluid dynamics is used to calculate forces and moments on airplanes, determine the mass flow rate of petroleum through pipelines, predict weather patterns, explain nebulae in interstellar space, and model fission weapon detonation.
Ques. What is fluid?
Ans. A fluid is a liquid, gas, or other substance that continuously flows and deforms when an external force or shear stress is applied.
Ques. What is hydrodynamics?
Ans. Hydrodynamics is a branch of fluid mechanics that deals with the motion of liquids and the forces acting on them. It encompasses the study of how liquids respond to various forces, including pressure, gravity, and viscosity, and how these forces influence their movement and behavior.
Ques. What are the Dynamics of Computational Fluid?
Ans. Computational fluid dynamics is a branch of fluid mechanics that solves and interprets fluid flow issues using numerical models and algorithms. High-speed supercomputers are used to calculate the amount of data required to model the interaction of liquids and gasses.
Ques. Can the fluid withstand shear force?
Ans. Fluids, unlike solids, cannot resist shear stress or deformation when subjected to shear forces. This is because fluids lack the rigid internal structure of solids that allows them to maintain their shape under stress. When a shear force is applied to a fluid, it simply deforms continuously, with the layers of fluid sliding past each other.
Ques. What is Bernoulli's principle?
Ans. Bernoulli's principle is a basic concept in fluid dynamics which relates pressure, velocity, and height. According to Bernoulli's principle, an increase in fluid speed occurs simultaneously with a decrease in static pressure or the fluid's potential energy.
Ques. How does viscosity affect fluid flow?
Ans. Viscosity is an important property of fluids that describes their resistance to deformation and flow. It is often characterized as the "thickness" of a fluid. Highly viscous fluids, like honey or molasses, have a high resistance to flow and move slowly, while low-viscosity fluids, like water or oil, flow more easily.
Ques. Define compressibility.
Ans. Compressibility is a measurement of how much a particular volume changes instantaneously when subjected to pressure.
Ques. What is an ideal fluid?
Ans. A fluid is considered to be ideal if it cannot be squeezed or compressed. It doesn't have any viscosity. It is essentially a fictitious fluid that does not exist in the physical world.
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| Chapter Related Links | ||
|---|---|---|
| Mechanical Properties of Fluids MCQ | Terminal Velocity Formula | Tension Formula |
| Stoke’s Law | Density of Water | Hydraulic Machines |
| Viscosity | Bernoulli’s Principle | Pascal’s Law |
Long Answers Questions [3 Marks Questions]
Ques. What are the different aspects of fluid mechanics?
Ans. Fluid mechanics is a branch of physics that studies fluids and their motion. The following are the three aspects of fluid mechanics:
- Fluid Kinematics: Fluid kinematics is the study of moving fluid.
- Fluid Statics: Fluid statics is the study of fluids at rest.
- Fluid Dynamics: Fluid dynamics is the study of all pressures and effects of a flowing fluid.
Ques. What is the difference between laminar and turbulent flow?
Ans. The differences between laminar and turbulent flow are
| Laminar Flow | Turbulent Flow |
|---|---|
| It is a fluid flow in which the fluid layers move in parallel without crossing. | It is a type of fluid flow in which the fluid layers cross rather than move in parallel. |
| Laminar flow occurs most frequently in low-velocity fluids. | High-velocity fluids are the most likely to exhibit turbulent flow. |
| Laminar flow occurs in low-velocity fluid flow in small-diameter pipelines. | Large-diameter pipes with high-velocity fluid flow experience turbulent flow. |
| The fluid flow is laminar when the Reynolds number (Re) is less than 2000. | The fluid flow is turbulent when the Reynolds number (Re) exceeds 4000. |
Ques. What are the different properties of fluids?
Ans. Although each fluid is unique in terms of composition and specific qualities, all fluids have some characteristics. These characteristics are classified as follows:
- Kinematic properties: These properties help in the understanding of fluid motion. The kinematic properties of fluids are velocity and acceleration.
- Thermodynamic characteristics: Fluid thermodynamic properties include temperature, density, pressure, and specific enthalpy.
- Physical properties: These characteristics, like as color and odor, help in determining the physical state of the fluid.
Very Long Answers Questions [5 Marks Questions]
Ques. What are the different types of fluid flow?
Ans. The different types of fluid flow are
- Steady and Unsteady: A steady fluid flow occurs when the velocity, pressure, and cross-sectional area stay consistent independent of position or stream. Unsteady fluid flow occurs when the fluid's characteristics, such as velocity, pressure, or cross-sectional area, fluctuate over time at any point in the flow.
- Viscous and Non-viscous: In a viscous fluid flow, which normally occurs at a lower velocity, fluid characteristics like velocity, pressure, or cross-sectional area are constant for that period of time or at that location of observation. Non-viscous fluid flow is defined as a fluid with no internal friction but a significant resistance to fluid flow.
- Laminar and Turbulent: Laminar flow is a type of streamlined flow in which the fluid flow is smooth and constant in velocity, pressure, and cross-sectional area at a given point in time and space. In this type of flow, the streamlines are all parallel to one another. Turbulent flow is a type of flow in which the inertial forces of the fluid are dominant, and it is often observed to flow with a higher velocity and speed at any given point and time.
- Uniform and non-uniform: The velocity at a particular instant of time in uniform fluid flow is the same at any location of the fluid and has the same magnitude in all directions. The velocity of the fluid varies at every instant for every place at any time in non-uniform fluid flow.
- Compressible and incompressible: The density of a fluid incompressible fluid flow can fluctuate over time depending on the pressure or shear forces acting on it. At normal room temperature, most fluids in nature are incompressible; this is the property of a fluid in which the density does not change when shear forces affect it.
- Rotational and irrotational: While flowing, the fluid in rotational fluid flow rotates around its own axis. The fluid does not rotate around its own axis in irrotational fluid flow.
- One, two, and three-dimensional: When fluid parameters such as velocity, density, and pressure are present in one, two, or three directions, the flow is referred to as one-dimensional, two-dimensional, or three-dimensional fluid flow.
Ques. What are the applications of fluid dynamics?
Ans. The following are the applications of fluid dynamics in real-life
- Air Conditioners and Refrigerators: Both air conditioners and freezers use water as their fluid. The function of water in an air conditioner and refrigerator is to absorb heat in the room and release it into the atmosphere outside. Heat is transferred from the high-temperature area to the low-temperature area by the fluids.
- Thermal Power Plants: Water is the commonly used fluid in thermal power plants. Thermal power plants generate electricity by heating water in a boiler and converting it into hot steam, which then passes through the turbine blades. This generates electricity.
- Nuclear Power Plants: Water is used as both the working fluid and the coolant in nuclear power reactors. In a few nuclear power plants, the heart of the nuclear reactors is not directly used to generate steam.
- Hydraulic Machines: Fluid is an essential component of hydraulic machines. Hydraulic machines are those that use water or oil to function. These devices run on either water or oil. Fluids such as water and oil can lift heavy weights and apply pressure.
- Hydroelectric Power Plants: On a large scale, water is utilized to generate power. The dam's water holds potential energy, which is eventually released on the turbines, which generate electricity. Hydroelectric energy is one of the world's leading sources of electricity today.
Ques. What is the importance of fluid dynamics?
Ans. The importance of fluid dynamics is as follows
- Fluid dynamics is an essential part of physics. Fluid has immense power and can be used to generate electricity.
- Fluids produce a lot of heat when burned. This can be used for a variety of purposes. One such example is the use of gasoline or diesel in automobiles.
- Some fluids can lift tons of weight while exerting immense pressure.
- Oils and water are two examples of fluids that can do so. This is seen in the use of hydraulic machinery and hydraulic lifters.
- The ability to flow is the most important property of the fluid. This characteristic is most useful in devices that require constant lubrication. Oils are a good example since they are used to lubricate machine parts.
- Water has both potential and kinetic energy, both of which can be used to generate electricity.
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